EP0068860A2 - Optische Lesevorrichtung - Google Patents

Optische Lesevorrichtung Download PDF

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Publication number
EP0068860A2
EP0068860A2 EP82303354A EP82303354A EP0068860A2 EP 0068860 A2 EP0068860 A2 EP 0068860A2 EP 82303354 A EP82303354 A EP 82303354A EP 82303354 A EP82303354 A EP 82303354A EP 0068860 A2 EP0068860 A2 EP 0068860A2
Authority
EP
European Patent Office
Prior art keywords
light
yellow
line
green
contrast
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP82303354A
Other languages
English (en)
French (fr)
Other versions
EP0068860A3 (en
EP0068860B1 (de
Inventor
Masuji Sato
Toshiaki Naka
Fumiaki Yamada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=27308641&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0068860(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from JP56098362A external-priority patent/JPS589465A/ja
Priority claimed from JP56140854A external-priority patent/JPS5843655A/ja
Priority claimed from JP56141646A external-priority patent/JPS5843656A/ja
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP0068860A2 publication Critical patent/EP0068860A2/de
Publication of EP0068860A3 publication Critical patent/EP0068860A3/en
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Publication of EP0068860B1 publication Critical patent/EP0068860B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/028—Details of scanning heads ; Means for illuminating the original for picture information pick-up
    • H04N1/03—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array
    • H04N1/031—Details of scanning heads ; Means for illuminating the original for picture information pick-up with photodetectors arranged in a substantially linear array the photodetectors having a one-to-one and optically positive correspondence with the scanned picture elements, e.g. linear contact sensors
    • H04N1/0318—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light-source, a lens array and a photodetector array which are supported by a single-piece frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03112—Light source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03133—Window, i.e. a transparent member mounted in the frame
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03141—Photodetector lens
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/028—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up
    • H04N2201/03—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted
    • H04N2201/031—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted for picture information pick-up deleted deleted
    • H04N2201/03104—Integral pick-up heads, i.e. self-contained heads whose basic elements are a light source, a lens and a photodetector supported by a single-piece frame
    • H04N2201/03108—Components of integral heads
    • H04N2201/03145—Photodetector

Definitions

  • This invention relates to an optical reader for use, for example, in a facsimile transmitter.
  • a facsimile transmitter is used to transmit an image of graphic material rapidly to a remote point.
  • the image of the original material is changed into electrical signals which are sent by the transmitter to a facsimile receiver.
  • the received signals are changed to an image of the original material at the receiver.
  • An optical reader is used to change the image of the original material into electrical signals.
  • a light source for lighting the original material comprises arrays of green light-emitting diodes (LEDs) having a centre wavelength of 555 nm (nanometres) so that sufficient contrast of the original material can be obtained so as to distinguish clearly material printed in red.
  • the luminous intensity of a green LED is weak.
  • the length of one LED array and the number of LEDs contained therein correspond to the width of the original material.
  • Two green LED arrays are necessary in order to light the original material with a luminous intensity sufficient for the photosensor to distinguish the original material.
  • An object of the present invention is to alleviate the above-mentioned problems.
  • An optical reader comprises a light source comprising at least one array of LEDs for lighting original material to be read; optical guide means for guiding light reflected from the original material; and an image sensor to which the reflected light is guided'by the optical guide means and which converts the reflected light to electrical signals, characterised in that the light source comprises at least one array of yellow LEDs.
  • the optical reader comprises an image sensor unit 1 comprising a feed roller 3 for feeding a sheet 2 bearing the original material which is to be read.
  • a light source 4 comprises an array of LEDs.
  • An actuating circuit 7 is provided for actuating the photodetector 6.
  • the original material 2 is moved by the feed roller 3 towards the right, in the direction of the arrow, under the image sensor unit 1. During this movement, the original material 2 is illuminated by the light source 4, and the reflected light is guided to the photodetector 6 through the optical guide means 5. There, the light intensity is transformed to electrical signals.
  • the optical reader must discriminate material which is usually in black, red or blue on white paper.
  • black, red or blue colours should reflect substantially no light from the light source 4, whilst white paper should fully reflect the light from the light source.
  • the reflection characteristics of various colours are depicted in the graph of Fig.2.
  • the abscissa represents the wavelength in nm (nanometers)
  • the ordinate represents the reflection ratio (%)
  • the solid line A represents the characteristic of reddish orange (colour code No. 6055 of Toyo Ink Co.)
  • the dash-dot line B represents the characteristic of blue (colour code No. 6215)
  • the dotted line C represents the characteristic of black (colour code No. 6301).
  • the optical reader judges the original material as being white if its reflection ratio is more than 50%, while it judges the original material as being black if its reflection ratio is less than 50% thereby creating a binary signal.
  • the original material is illuminated by an orange light having a centre wavelength of 605 nm
  • the original material in red (line A) is judged as being white since its reflection ratio in the orange light is more than 50%. Therefore, a source emitting light having a centre wavelength of more than about 600 nm cannot be used as the light source 4.
  • the original material is illuminated by yellow LEDs having a centre wavelength of 570 nm, or by green LEDs having a centre wavelength of 555 nm, each of the original materials in red, blue and black (lines A, B and C) is judged as being black.
  • a yellow LED or a green LED can be used as the light source 4.
  • the original material is illuminated by light having a centre wavelength of less than 510 nm, the original material coloured blue (line B) is judged as white. Therefore, this light cannot be used as the light source 4.
  • the wavelength of the light for illuminating the original material should be between about 520 nm and 590 nm.
  • the light source is a yellow LED array of 88 LEDs which emit light having a centre wavelength of 570 nm.
  • the light source is a green LED array of 88 LEDs which emit light having a centre wavelength of 555 nm.
  • the abscissa represents the input current
  • the ordinate represents the contrast of the original material
  • line D represents the contrast of red to white
  • line E represents the contrast of black to white
  • line F represents the contrast of blue to white.
  • the lines D, E and F are above the critical contrast level (about 3) for detecting the original material. Therefore, either yellow or green LEDs can be used as the light source,from the viewpoint of the contrast characteristics of the original material.
  • the photodetector 6 presents a different resistance characteristic when illuminated by a green light as compared with a yellow light, as shown in Fig.5.
  • the abscissa represents the input current fed to the light source
  • the ordinate represents the resistance-in-light of the photodetector
  • line G represents the resistance for light from a yellow LED having a centre wavelength of 570 nm
  • line H represents the resistance for light from a green LED having a centre wavelength of 555 nm.
  • the resistance of the photodetector 6 in yellow light is much less than in green light.
  • the luminous intensity of an LED is graphically depicted in Fig.6.
  • the abscissa represents the input current fed to the LED
  • the ordinate represents the luminous intensity of the LED
  • line J represents a yellow LED having a centre wavelength of 570 nm
  • line K represents a green LED having a centre wavelength of 555 nm.
  • the luminous intensity of the yellow LED is more than five times the luminous intensity of the green LED at the same input current.
  • the optical reader of the present invention has as its light source a yellow LED array having a centre wavelength of 570 nm and a half width of 30pm.
  • a single LED array is sufficient as the light source,due to the high luminous intensity of yellow LEDs, whilst two green LED arrays are required in the optical reader of the prior art. Therefore, assembly and adjustment of the light source can be easily carried out, and labour costs, as well as the cost of the parts, can be decreased.
  • the power consumption is decreased to about one third that of conventional green LEDs and the generation of heat is therefore decreased, whereby degradation of the photodetector or image sensor, such as weakening of the luminous intensity or lowering of the output power thereof, is avoided.
  • LEDs such as a yellow LED having a 570 nm wavelength and a green LED having a 555 nm wavelength, are on the market.
  • the luminous intensity of such a yellow LED (line J) is more than five times the luminous intensity of a green LED (line K).
  • the necessary input current fed to a yellow LED in order to obtain the same luminous intensity as that of a green LED is about one fifth the input current of the green LED. Therefore, the consumption of power of a yellow LED is much less than that of a green LED.
  • the resistance-in-light of a photodetector made of cadmium selenium (CdSe) is graphically illustrated in Fig.5.
  • the resistance of the photodetector illuminated by the light of a yellow LED (line G) is lower than the resistance in the light of a green LED (line H). Therefore, yellow is superior to other colours as the colour of the light source.
  • the contrast of red in the light of yellow LEDs is small, causing incorrect detection of the original material since the margin of the detector output for making a binary signal is small.
  • the contrast of the original material to white paper is determined by dividing the resistance-in-light of the photodetector in the light reflected by the original material by the resistance-in-light of the photodetector in the light reflected by the white paper.
  • Such contrast of the original material to the white paper relative to the input current to one chip of the LED array of the light source is illustrated in Fig.7.
  • Line L represents the contrast of black (colour code No. 6301 of Toyo Ink.Co.) in yellow light
  • line M represents the contrast of red near orange (colour code No.
  • line 0 represents the contrast of the red of line M in green light
  • line P represents the contrast of black in green light.
  • the contrast of black (line L) is large enough (about 20) to enable detection of the original material.
  • the contrast of red (line M) is only slightly above the critical level (line N).
  • the margin of contrast is small.
  • the contrast of red in green light (line 0) is larger than that in yellow light (line M), since green is a complementary colour of red.
  • the resistance-in-light of the photodetector in green light is large, as can be seen from Fig. 5.
  • An embodiment of the present invention alleviates the above-mentioned low contrast of red in yellow light.
  • An LED array according to the present invention is illustrated in Fig. 8. This array comprises a plurality of yellow LED chips 8, each of which is provided with a dome 9 of green or yellow transparent material. Another example of the LED array is illustrated in Fig. 9(a). This array comprises a continuous cover 10 of green or yellow transparent material disposed over the row of chips 8, instead of the domes 9 of Fig. 8.
  • the contrast characteristics of red and black to white paper in the light from the above-mentioned LED array according to the present invention are graphically depicted in Fig. 10.
  • the abscissa represents the input current for each chip of the LED array, the ordinate represents the contrast to white paper, line Q represents the contrast of the original red material in the light from the light source comprising the yellow domes, line R represents the contrast of the original red material in the light from the light source comprising the green domes, line S represents the contrast of the original black material in the light from the light source comprising the yellow domes, line T represents the contrast of the original black material in the light from the light source comprising the green domes, line L represents the contrast of the original black material in the light from the light source comprising domes of completely transparent material, line M represents the contrast of the original red material illuminated by the light source comprising domes of completely transparent material, and line N represents the critical contrast level.
  • the reason for this increase in contrast is as follows.
  • the luminous intensity of the LED relative to the wavelength is represented in Fig. 11.
  • Line U represents the light of a green LED and line V represents the light of a yellow LED.
  • the green light (line U) contains about 20% of a reddish light component having a wavelength of more than 580 nm, which component degrades the contrast of red.
  • the yellow light (line V) contains about 60% of such reddish light component.
  • the yellow dome removes such reddish light component so that the contrast of red is enhanced.
  • the luminous intensity of the yellow light after the removal of 60% of the reddish light component is still large enough to enable detection of the original material, since the luminous intensity of the yellow light is primarily very large, as was mentioned with reference to Fig. 6.
  • a line W represents the red of colour code No. 6055
  • a line X represents a reddish orange stamp colour
  • line Y represents a red colour.
  • the line W rises at a wavelength smaller than the wavelength at which the line X or Y rises. This means that the red of the colour code No. 6055 is the least detectable reddish colour when the characteristics of the LED of Fig. 11 are considered.
  • the present invention makes possible enhancement of the contrast of this latter red colour, as illustrated in Fig. 10.
  • a yellow or green transparent dome or cover is provided over each of the yellow LEDs of the light source so that the contrast of red is enhanced and the reliability of detection is upgraded.
  • Yellow light has advantageous points as a light source for illuminating the original material, as was mentioned hereinbefore.
  • the contrast of red to white paper in yellow light (line Z) is smaller than the contrast of red in green light (line ZA).
  • the margin of contrast of red in yellow light is small since the contrast of the line Z is only slightly over the critical level (line N) as compared with the contrast of line ZA.
  • Such a small margin of contrast causes instability in the characteristic of the photodetector when the ambient temperature changes, and causes incorrect detection of the original material due to the low contrast.
  • FIG. 14 An example of the construction of an optical reader according to the present invention is illustrated in Fig. 14.
  • Original material 17, a Selfoc lens 18, a photodetector array 19, and two LED arrays 20 and 21 are illustrated.
  • One of the arrays 20, which is disposed in one side of the lens 18, comprises green LEDs having a centre wavelength of 555nm.
  • the other array 21, which is disposed at the other side of the lens 18, comprises yellow LEDs having a centre wavelength of 570 nm.
  • the input current fed to these LED arrays 20 and 21 is adjusted so that illumination intensity of the yellow LED array is equal to or slightly larger than that of the green LED array. Both of the LED arrays 20 and 21 simultaneously illuminate the original material 17.
  • the relationship between the input currect of the yellow LED and the input current of the green LED is depicted in Fig. 15, both LEDs producing light of the same luminous intensity.
  • the contrast of red to white in the light of the above--mentioned two LED arrays of the same luminous intensity is represented by line ZD in Fig. 16.
  • the line ZD is sufficiently above the critical line N as compared with the line ZF, which represents the contrast of red in the light from the yellow LED array only. Therefore, although the consumption of power is increased as compared with the case of the line ZF, the margin of contrast is largely widened so that the stability of detection is upgraded when the ambient temperature changes.
  • the contrast of the line ZD is lowered as compared with that of the line ZE, which represents the contrast of red in the light of the green LED array only.
  • the line ZD is sufficiently above the critical level N so that reliable detection of the original material can be achieved.
  • the length (distance) between the original material and the photodetector is considered hereinafter from the viewpoint of MTF which corresponds to the discriminating power of the photodetector.
  • the graph of Fig. 17 represents the MTF for four pair lines relative to the distance between the original material and the photodetector.
  • a Selfoc lens having a 16.7 mm focus was used as the optical guide means.
  • a line ZG represents green light having a 555 nm wavelength
  • a line ZH represents yellow light having a 570 nm wavelength
  • a line ZI represents simultaneous lighting by green and yellow LEDs.
  • An MTF of more than 50% is necessary to obtain reliable discrimination of the original material.
  • each line has more than - 1 mm of range of distance between the original material and the photodetector at an MTF of 50% and the difference between the lines is small. Therefore, the distance between the original material and the photodetector in the case where green and yellow.LED arrays are used simultaneous is almost the same as the distance in the case where a green LED array only is used. Therefore it is unnecessary to change the size of the conventional construction when using green and yellow LEDs simultaneously.
  • FIG. 18 Another example of the optical reader according to the present invention is illustrated in Fig. 18.
  • This optical reader comprises light sources 25 and 25', optical guide means 27, a photodetector 28, and colour filters 29 and 29'.
  • Light from the light sources 25 and 25' is reflected by original material 26 and passes through the colour filter 29, the optical guide means 27, and the other colour filter 29', and is then detected by the photodetector 28, which produces an image of the original material 26.
  • the characteristics of the light sources 25 and 25' and the colour filters 29 and 29' will be described later.
  • FIG. 19 A variation of the above optical reader is illustrated in Fig. 19. Like parts as in Fig. 18 are referred to by like numerals.
  • the construction of Fig. 19 differs from the construction of Fig. 18 in that it comprises only one colour filter 29 at the front end of the optical guide means 27 instead of comprising two filters at opposite ends of the guide means.
  • Lines B-460 and B 480 represent the characteristics of blue filters, and lines G-550 and G-533 represent the characteristics of green filters.
  • a line ZJ represents the luminance characteristic of a yellow LED relative to wavelength
  • a line ZK represents the luminance characteristic of the light of a yellow LED filtered through a green filter reflected by fine paper.
  • the luminance of the light filtered through the green filter is decreased at the portion of the long wavelength near red.
  • the detector resistance-in-light relative to the input current for each chip of the LED array is graphically depicted in Fig. 22 so as to compare a light source without a colour filter with a light source with a colour filter.
  • a line ZL represents the case of a conventional light source without a colour filter
  • a line ZE represents the case of a light source with a green filter according to an embodiment of the present invention.
  • the photodetector comprises a photoconductive CdSe chip.
  • the original material is a fine paper.
  • a line ZN represents black in unfiltered light
  • a line ZO represents black in light filtered through the green filter
  • a line ZP represents red in light filtered through a green filter
  • a line ZQ represents red in an unfiltered light.
  • the present invention has an advantage in practical use of the optical reader in that the contrast of red is increased as depicted in Fig. 23, which makes it possible to distinguish reliably graphic material printed in red near orange (colour code No. 6055), which shade of red is the most difficult to discriminate.
  • the present invention has another advantageous feature as follows.
  • the distance l' (Fig. 18 or 19) between the original material 26 and the optical guide means 27 is defined as follows. wherein l' is the distance between the original material and the optical guide means of the prior art not provided with a colour filter, and n is the index of refraction of the filter.
  • l' is larger than l, since n is usually 1.5 ⁇ 1.7. Therefore, it is possible to widen the angle of incidence 8 so that the light from the light source is effectively used, because the reflected light component in the direction perpendicular to the original material increases.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
EP82303354A 1981-06-26 1982-06-25 Optische Lesevorrichtung Expired EP0068860B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP56098362A JPS589465A (ja) 1981-06-26 1981-06-26 光学読取装置
JP98362/81 1981-06-26
JP56140854A JPS5843655A (ja) 1981-09-09 1981-09-09 原稿読取装置用光源
JP140854/81 1981-09-09
JP141646/81 1981-09-10
JP56141646A JPS5843656A (ja) 1981-09-10 1981-09-10 原稿読取装置用光源

Publications (3)

Publication Number Publication Date
EP0068860A2 true EP0068860A2 (de) 1983-01-05
EP0068860A3 EP0068860A3 (en) 1983-10-19
EP0068860B1 EP0068860B1 (de) 1986-02-12

Family

ID=27308641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82303354A Expired EP0068860B1 (de) 1981-06-26 1982-06-25 Optische Lesevorrichtung

Country Status (3)

Country Link
US (1) US4471384A (de)
EP (1) EP0068860B1 (de)
DE (1) DE3269059D1 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0177461A2 (de) * 1984-10-03 1986-04-09 Ing. C. Olivetti & C., S.p.A. Gerät zur Abtastung von auf einem Substrat dargestellter graphischer Information
FR2593614A1 (fr) * 1986-01-27 1987-07-31 Canon Kk Appareil de lecture d'images
GB2194410A (en) * 1986-05-20 1988-03-02 Sharp Kk Image reading unit
EP0438104A2 (de) * 1990-01-17 1991-07-24 Matsushita Electric Industrial Co., Ltd. Bildlesegerät
FR2661529A1 (fr) * 1990-04-27 1991-10-31 Dassault Electronique Dispositif de traitement d'imprimes comportant des cases a completer, notamment des bulletins de loterie.
CN105960318A (zh) * 2014-04-24 2016-09-21 东芝机械株式会社 挤出机用螺杆、挤出机以及挤出方法

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US4672219A (en) * 1984-06-28 1987-06-09 Oki Electric Industry Co., Ltd. Image reader with scanning by array of sequentially illuminated light sources
DE3524811A1 (de) * 1984-07-14 1986-01-23 Canon K.K., Tokio/Tokyo Bildabtastvorrichtung
JPS61105960A (ja) * 1984-10-30 1986-05-24 Toshiba Corp 情報読取装置
US5975674A (en) * 1990-04-04 1999-11-02 Hewlett-Packard Company Optical path optimization for light transmission and reflection in a carriage-mounted inkjet printer sensor
JP3118016B2 (ja) * 1990-07-06 2000-12-18 株式会社リコー 画像読み取り装置
JP2777000B2 (ja) * 1991-06-27 1998-07-16 ローム株式会社 イメージセンサ
EP0524336A1 (de) * 1991-07-25 1993-01-27 International Business Machines Corporation Optische Vorrichtung zum Lesen von Markierungen
US5248872A (en) * 1991-08-06 1993-09-28 Business Records Corporation Device for optically reading marked ballots using infrared and red emitters
US5883646A (en) * 1993-04-30 1999-03-16 Hewlett-Packard Company Compact flex-circuit for modular assembly of optical sensor components in an inkjet printer
US20030019934A1 (en) * 1998-07-08 2003-01-30 Hand Held Products, Inc. Optical reader aiming assembly comprising aperture
US6601768B2 (en) 2001-03-08 2003-08-05 Welch Allyn Data Collection, Inc. Imaging module for optical reader comprising refractive diffuser
US7270274B2 (en) 1999-10-04 2007-09-18 Hand Held Products, Inc. Imaging module comprising support post for optical reader
US6832725B2 (en) 1999-10-04 2004-12-21 Hand Held Products, Inc. Optical reader comprising multiple color illumination
WO2001026036A2 (en) * 1999-10-04 2001-04-12 Welch Allyn Data Collection, Inc. Imaging module for optical reader
US7787017B2 (en) * 2000-05-18 2010-08-31 OptigraP Sagl Digital camera and method for identification of objects
WO2015100264A1 (en) * 2013-12-23 2015-07-02 California Institute Of Technology Rotational scanning endoscope
CN107730448B (zh) * 2017-10-31 2020-11-27 北京小米移动软件有限公司 基于图像处理的美颜方法及装置

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Cited By (11)

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EP0177461A2 (de) * 1984-10-03 1986-04-09 Ing. C. Olivetti & C., S.p.A. Gerät zur Abtastung von auf einem Substrat dargestellter graphischer Information
EP0177461A3 (en) * 1984-10-03 1987-05-20 Ing. C. Olivetti & C., S.P.A. Device and apparatus for reading graphic information displayed on a substrate
FR2593614A1 (fr) * 1986-01-27 1987-07-31 Canon Kk Appareil de lecture d'images
GB2194410A (en) * 1986-05-20 1988-03-02 Sharp Kk Image reading unit
US4839730A (en) * 1986-05-20 1989-06-13 Sharp Kabushiki Kaisha Image reading apparatus
GB2194410B (en) * 1986-05-20 1990-05-09 Sharp Kk Image reading apparatus
EP0438104A2 (de) * 1990-01-17 1991-07-24 Matsushita Electric Industrial Co., Ltd. Bildlesegerät
EP0438104A3 (en) * 1990-01-17 1992-06-03 Matsushita Electric Industrial Co., Ltd. Image reading device
US5198655A (en) * 1990-01-17 1993-03-30 Matsushita Electric Industrial Co., Ltd. Image reading device having a light waveguide means widened toward an end nearest to an image surface
FR2661529A1 (fr) * 1990-04-27 1991-10-31 Dassault Electronique Dispositif de traitement d'imprimes comportant des cases a completer, notamment des bulletins de loterie.
CN105960318A (zh) * 2014-04-24 2016-09-21 东芝机械株式会社 挤出机用螺杆、挤出机以及挤出方法

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DE3269059D1 (en) 1986-03-27
EP0068860A3 (en) 1983-10-19
EP0068860B1 (de) 1986-02-12
US4471384A (en) 1984-09-11

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